Gage for indicating fluid-pressures.



C. J. MANNING.

GAGE FOR INDICATING FLUID PRESSURES.

APPLICATICN FILED FEB. 24, I912.

Patented 1060.28, 1915.

h s A" TWYV I love it t l lllhd li e/lilo COLEMAN J. MANNING, F MEDFORD, MASSACHUSETTS, ASSIG-NOR- TU AIEERIGAN STEAM GAUGE AND VALVE IvIA'iNUFAC'IURING COM?AI TE', 01 BGSTQN, MASSA- QHUSETTS, A COR-PORATEON 01? NEW JERSEY.

GAG-E FOR INDICATING FLUID-PRESSURES.

1 pgq p w I Speeificetio Application filed February 2 To all whom it may concern:

Be it known that l, COLEMAN J. .llilAN- turns, a citizennot the United States, and resident of lllerll'ihrd, in the county of Middlesex and State of Massachusetts, have invented certain new and useful improvements in Gages for indicating Fluid-lressures, of which the following is a specificstion.

This invention relates to a gage adapted to indicate pressure-either higher or lower than the pressure of the atmosphere, or in other words, a gage which is not only of the kind commonly known as a pressure gage, but one which is also a vacuum gage.

The principal object of the invention is to provide a gage suitable for these purposes, which is at the same time inexpensive and economical to build.

though the glass face and dial had been removed, only the case and the operating mechanism being shown. lhe case is of any usual or desired form, being conveniently of cast metal and having a cylindrical inclosing wall land a back wall which is provided with a flange 2 external to the cylindrical wall containing screw holes for convenience in mounting upon a support.

Within the inclosing wall is a casting or head 3 secured detachably bv screws 4, 5 and having it nipple l5 passing through the wall. A part 7 of the head is formed as a conduit and is in communication with the nipple 6. A curved spring tube or Born-don tube 8 is connected with the conduit 7 and lies well within the inclosing well. On the end of the spring 8 is secured a block 9, to which is pivoted a lever 10. The pivot for this lever is preferably a screw 11 passing through the fulcrum of the lever and threaded into the Letters Pa Patented Dec. 28., Milli,

i, 1912. Serial No. 679,?33.

, lolock'il, the head or such screw overlying the lever and being adapted to clamp the same in various positions. A supplemental clamp is provided in the screw 12, which passes into the block 9 through a slot 13 in a widened pert ll of one arm of the lever.

one end of the head or casting 3 is an upright or post 15 which supports the adjustable fulcrum of a lever l6. Said fulcrum is conveniently a screw 17 carried by a slotted plate 18 which is adjustable up and down on the upright and is secured in its venous adjustments by screws 19 and 20 which pass through it slot 2]. into the upright 15.

Un the head 3 is a lug or projection 22, formed conveniently us an integral part of the head, and detachably fastened to the head is plate 23 which extends over the lug 22 but is separated therefrom by a space of considerable width. The lug and plate furnish bearings for an arbor or shaft 24, which carries a pointer or other indicator. This pointer overlies the dial, which is omitted lroin the present drawings, hence the pointer is indicated in dotted lines. Secured to the arbor 2* is an arm shown best in Fig. 3, and overlying the arm is a slotted plate 26, which extends on both sides of the arbor. A slot of this plate contains the arbor and also it screw 28 which is threaded into the arm 25. Said plate, when secured by setting up the screw 28, constitutes a lever arin rigidly connected with the arbor. Pivotelly connected with the plate at one side oil? the arbor a link 29 of which the other end is pivotally connected to the lever 16 previously mentioned.

The lever 1U previously described. is con nected with the lever 16 by a stud 30 secured to lever ll) and passing through a slot 31 in lever 16. Such stud is preferably a screw, having shank 30 Fig. l which passes ireel through the slot 31, and a head which overlies the edges of the slot. The end of the shank which is screwed into lever 10 is reduced to provide a shoulder which is so placed as to come to e bearing on the lever 10 when the head of the screw is further distan from such lever than the thickness of the lever 16. In. this way the stud 30 may be tightened without binding the two levers together and thereby permitting the left.

This completes the description of the construction of the particular embodiment of my invention shown 1n the accompanying drawings.

It will be readily seen that an excess of pressure in the spring tube over that of the atmosphere will cause the block 9 on the end of the tube to move upwardly, while a diminution of-pressure to less than the atmospheric will produce an opposite effect, the external effect of such movements being proportional to the pressure differences. For the sake of brevity of description, I will term pressures greater than atmospheric as positive pressures and those less than atmospheric as negative pressures or vacuums. The effect of a positive pressure acting through the connections described is to .swing the pointer from left to right, and the effect of a negative pressure is to swing it to As the connections provide a multiplying leverage, very slight movements of .the spring tube produce comparatively wide movements of the pointer. As the lever 10 is rigid with the spring tube when adjusted, some slight play takes place between the stud and the lever 16 in these movements.

The amount of play, however is inappreciable and does not impair the accuracy of the instrument.

The construction described permits three distinct adjustments, one of which alters the amplitude of swing of the pointer for the same pressures, another of which changes .the position of the pointer without altering its amplitude of swing, and the third of which alters both the position and amplitude of movement of the pointer. The first of these adjustments is provided by the plate 26, which can be adjusted so as to bring its pivotal connection with the link 2-9 toward or from the pointer arbor 24-, and thereby shorten or lengthen the lever arm through which the link acts upon the pointer. The second is provided by the adjustable fulcrum 17, which can be raised or lowered,

that is, moved in a direction transverse to the lever 16, thereby turning such lever about the stud 30 and shifting the position of the pointer. The ldlrll'tl adjustment is accomplished by swinging the lever 10 about its point of adjustment with the block 9, and thereby shifting the stud 30 in the slot 31. This slot is inclined to the path in which stud 30 moves when such adjustments are made, consequently the lever 16 is then turned about the fulcrum l7 and the pointer shifted to one side or the other. At the same, time the lever arm represented by the distance between the stud Bd and fulcrum 17 is varied, and thereby theamox'ement of the pointer with respect to that of the spring is changed.- This adjustmen. or calibration -is a finer and more delicate one than is given by movement of the plate 26 on the arm 25,

and supplements such adjustment.

A gage made as hereinbefori described' adjustment enable the gage to be calibrated j with accuracy.

The foregoing detailed description has been given in order to furnish sufficiently complete information to enable others skilled in the art to make and use the invention upon expiration of my exclusive right to the same, but without intending to limit my invention to the exact constructions described.

It is within my contemplation to provide other constructions varying considerably in appearance from this one but having the equivalent provisions for operation and adj ustment.

While I have designated the members 18 and 26 by the term plate, it is to be understood that such term is intended to be merely descriptive of the particular members illustrated and is not intended to be a limiting term. I consider that any member capable of serving the functions of the plates 18 and '26, as hereinbefore described, is within the scope of my invention and within the mean-* ing of the term plate as herein used,

I claim: 1. A. gage for lndicating pressures, comwhich the pressure is to be measured, an oscillatively mounted ind1cator, an arm connected w1th said indicator, a link pivoted to prising an actuator movable by the fluidfloflr said arm, a lever pivotally connected with.

said link, a fulcrum for said lever, and a member secured to, and projecting rigidly from, said actuator, and having a sliding engagement with the said lever.

52. A gage for indicating pressures, comprising an actuator movable by the fluid of whlch the pressure is to be measured, an

a head secured in said case and having a nippleexternal to the case, said head having also a conduit portion con'nnunicating with 1 the nipple. a curved spring tube adapted to be mounted upon the head in communi cation with the conduit portion, a lever pivotally mounted upon the free end of said spring tube, and adapted to be lined in 4. A gage comprising essentially, a case,

a head secured in said case and having a nipple external to the case, said. head having also a conduit portion communicating with the nipple, a curved spring tube adapted to be mounted upon the head in communication with the conduit portion, a lever pivotally mounted upon the free end of said spring tube, and adapted to be fixed in various positions angularly about its pivot, a post or upright projecting from "said head, a.

plate adjustably mounted on said post and movable in a line approximately parallel to said lever, a lever having its fulcrum on said plate, extending transversely of the first named lever, and having a connection therewith, a link connected to the'second named lever, an indicator arbor, and an arm attached to said arbor and connected with,

said link, the effective length of said arm being variable, whereby to alter the amplitude of'movement of the arbor.

5, A gage comprising essentially, a case, a head secured in said case and having a nipple external to the case, said head having also a conduit portion communicating with the nipple, a curved spring tube adapted to be mounted upon the head in communication with the conduit portion, a lever pivotally mounted upon the free end of said spring tube, and adapted to be fixed in various positions angularly about its pivot, a post or upright projectii'ig from said head, a leverhaving its fulcrum on said post, extending transversely of the first named lever, and having connection. tl'ierewith, a link connected to the second named lever, an indicator arbor, and an. arm attached to said arbor and connected with said. link, the connection oetween. said levers being provided nv a stud on the iii-st named lever entering a slot in the second named lever, said slot be- ,clined to the ments of the stud iced by angular adjustments of the first named lever, whereby such adjustments may change both the position of the arbor and the amplitude of movement thereof.

6. A gage comprising a spring tube, a

J lever pivoted to said tube adjustable about its pivot, means for securing said lever rigidly to said tube in its various adjustments, a pivotally mounted second lever extending transversely of said first lever and having a sliding and oscillative en agement therewith, whereby adjustment 0 the first lever causes movement of the second lever about its fulcrum and alters the leverage which said first lever exerts on the second lever, an oscillative pointer, an arm connected to said pointer, a plate adjustable longitudinally of said arm, and a link connecting said second lever and said plate.

7 A pressure gage comprising essentially, a pivotally mounted pointer, an arm connected to said pointer, a plate connected to said arm with provision for adjustment longitudinally thereof, a link connected to said plate, a pivotally mounted lever having an adjustable fulcrum connected to said link, a pressure actuated member, and a motionapplying connection between said member and said lever, adjustable With respect to both, whereby to change the position and amplitude of motion of said lever.

8. In a pressure indicating gage, the combination with a pressure operated actuator and an indicator, of motion transmitting connections between said actuator andindicator, comprising a lever, means for connecting said lever with the indicator, said means adjustable in a manner such as to vary the amplitude of movement of the indicator, an adjustable fulcrum for said lever, by adjustments. of which the position of the indicator may be altered, and adjustable connecting means between the actuator and .an intermediate point of the lever, adjust- 

